Westell (WSTL) 10-Q 4 Nov 16 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2016	Oct. 21, 2016
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Registrant Name	WESTELL TECHNOLOGIES INC
Entity Central Index Key	1,002,135
Current Fiscal Year End Date	--03-31
Entity Filer Category	Smaller Reporting Company
Class A Common Stock
Entity Common Stock, Shares Outstanding		47,719,554
Class B Common Stock
Entity Common Stock, Shares Outstanding		13,937,151

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,917	$ 19,169
Short-term investments	0	10,555
Accounts receivable (net of allowance of $41 and $53 at September 30, 2016, and March 31, 2016, respectively)	13,639	16,361
Inventories	12,678	13,498
Prepaid expenses and other current assets	1,923	1,900
Total current assets	49,157	61,483
Land, property and equipment, gross	16,185	17,198
Less accumulated depreciation and amortization	(13,731)	(13,221)
Land, property and equipment, net	2,454	3,977
Intangible assets, net	17,987	20,388
Other non-current assets	168	183
Total assets	69,766	86,031
Current liabilities:
Accounts payable	4,619	7,856
Accrued expenses	3,570	3,426
Restructuring Reserve, Current	2,951	1,537
Accrued compensation	1,397	2,506
Contingent consideration payable	0	311
Deferred revenue	1,318	1,601
Total current liabilities	13,855	17,237
Deferred revenue non-current	1,388	1,236
Net deferred income tax liability	24	10
Restructuring Reserve, Noncurrent	192	550
Other non-current liabilities	249	314
Total liabilities	15,708	19,347
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, par $0.01, Authorized - 1,000,000 shares. Issued and outstanding - none	0	0
Additional paid-in capital	415,460	414,374
Treasury stock at cost – 17,726,934 and 17,560,758 shares at September 30, 2016, and March 31, 2016, respectively	(35,313)	(35,174)
Cumulative translation adjustment	608	608
Accumulated deficit	(327,313)	(313,735)
Total stockholders’ equity	54,058	66,684
Total liabilities and stockholders’ equity	69,766	86,031
Class A Common Stock
Stockholders’ equity:
Common stock, value	477	472
Class B Common Stock
Stockholders’ equity:
Common stock, value	$ 139	$ 139

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Accounts receivable, allowance	$ 41	$ 53
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	17,726,934	17,560,758
Class A Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	109,000,000	109,000,000
Common stock, shares outstanding	47,724,218	47,184,725
Class B Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	13,937,151	13,937,151
Common stock, shares outstanding	13,937,151	13,937,151

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended			6 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Income Statement [Abstract]
Revenue		$ 17,780		$ 25,514	$ 32,596		$ 47,084
Cost of revenue (1)		11,413	[1]	15,283	21,664	[1]	28,424
Gross profit		6,367		10,231	10,932		18,660
Operating expenses:
Research and development		3,327		4,625	7,604		9,711
Sales and marketing		2,896		4,113	6,277		7,309
General and administrative		2,218		2,493	4,563		5,462
Intangible amortization		1,201		1,432	2,401		2,831
Restructuring		2,601			2,565		17
Impairment of Long-Lived Assets to be Disposed of		0		0	1,181		0
Total operating expenses		12,243		12,663	24,591		25,330
Operating profit (loss)		(5,876)		(2,432)	(13,659)		(6,670)
Other income (expense), net		74		(61)	91		(23)
Income (loss) before income taxes and discontinued operations		(5,802)		(2,493)	(13,568)		(6,693)
Income tax benefit (expense)		(8)		20	(10)		82
Net income (loss) from continuing operations		(5,810)		(2,473)	(13,578)		(6,611)
Discontinued Operations:
Income from discontinued operations, net of income tax of $172 for the six months ended September 30, 2015							272
Net income (loss) (2)	[2]	$ (5,810)		$ (2,473)	$ (13,578)		$ (6,339)
Basic net income (loss) per share:
Basic net income (loss) from continuing operations		$ (0.09)		$ (0.04)	$ (0.22)		$ (0.11)
Basic net income (loss) from discontinued operations		0		0	0		0
Basic net income (loss) (3)		(0.09)		(0.04)	(0.22)		(0.10)	[3]
Diluted net income (loss) per share:
Diluted net income (loss) from continuing operations		(0.09)		(0.04)	(0.22)		(0.11)
Diluted net income (loss) from discontinued operations		0		0	0		0
Diluted net income (loss) (3)		$ (0.09)		$ (0.04)	$ (0.22)		$ (0.10)	[3]
Weighted-average number of common shares outstanding:
Basic (shares)		61,199		60,783	61,108		60,743
Effect of dilutive securities: restricted stock, restricted stock units, performance stock units and stock options (4)	[4]	0		0	0		0
Diluted (shares)		61,199		60,783	61,108		60,743
[1]	The three and six months ended September 30, 2016, includes $0.2 million and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory.
[2]	Net income (loss) and comprehensive income (loss) are the same for the periods reported.
[3]	Totals may not sum due to rounding.
[4]	The Company had 5.3 million and 5.7 million shares represented by common stock equivalents for the three and six months ended September 30, 2016, and 3.7 million and 3.5 million shares represented by common stock equivalents for the three and six months ended September 30, 2015, which were not included in the computation of average dilutive shares outstanding because they were anti-dilutive. In periods with a net loss from continuing operations, the basic loss per share equals the diluted loss per share as all common stock equivalents are excluded from the per share calculation.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Operations Condensed Consolidated Statements of Operations Parenthetical (Unaudited) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Production Related Impairments or Charges	$ 200		$ 1,600
Discontinued Operation, Tax Effect of Discontinued Operation				$ 172
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5.3	3.7	5.7	3.5

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	[1]	$ (13,578)	$ (6,339)
Reconciliation of net loss to net cash used in operating activities:
Depreciation and amortization		3,230	3,495
Impairment of Long-Lived Assets to be Disposed of		1,181	0
Stock-based compensation		1,093	710
Loss on sale of fixed assets		(11)
Restructuring		2,565	17
Deferred taxes		14	57
Exchange rate loss (gain)			60
Changes in assets and liabilities:
Accounts receivable		2,722	(5,342)
Inventories		820	4,009
Prepaid expenses and other current assets		(23)	815
Other assets		15	118
Deferred revenue		(131)	(845)
Accounts payable and accrued expenses		(4,800)	2,151
Accrued compensation		(1,109)	1,325
Net cash provided by (used in) operating activities		(7,990)	231
Cash flows from investing activities:
Maturities of held-to-maturity short-term debt securities		12,621	16,625
Maturities of other short-term investments			5,586
Purchases of held-to-maturity short-term debt securities		(2,066)	(1,781)
Proceeds from sale of land			264
Purchases of property and equipment		(498)	(1,530)
Net cash provided by (used in) investing activities		10,057	19,164
Cash flows from financing activities:
Purchases of treasury stock		(141)	(85)
Payment of contingent consideration		(175)	(455)
Net cash provided by (used in) financing activities		(316)	(540)
Gain (loss) of exchange rate changes on cash		(3)	(3)
Net increase (decrease) in cash and cash equivalents		1,748	18,852
Cash and cash equivalents, beginning of period		19,169	14,026
Cash and cash equivalents, end of period		$ 20,917	$ 32,878
[1]	Net income (loss) and comprehensive income (loss) are the same for the periods reported.

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Description of Business Westell Technologies, Inc. (the Company) is a holding company. Its wholly owned subsidiary, Westell, Inc., designs and distributes telecommunications products, which are sold primarily to major telephone companies. Noran Tel, Inc. is a wholly owned subsidiary of Westell, Inc. Noran Tel's operations focus on power distribution product development. Basis of Presentation and Reporting The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2016 . All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the unaudited interim financial statements included herein reflect all adjustments, consisting of normal recurring adjustments, necessary to present fairly the Company’s condensed consolidated financial position and the results of operations, comprehensive income (loss) and cash flows at September 30, 2016 , and for all periods presented. The results of operations for the periods presented are not necessarily indicative of the results that may be expected for fiscal year 2017 . Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates. Recently Issued Accounting Pronouncements Not Yet Adopted In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230) (ASU 2016-15). This update is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The update provides new guidance regarding the classification of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investments, beneficial interests in securitized transactions, and separately identifiable cash flows and application of the predominance principle. This standard will be effective for financial statements issued by public companies for the annual and interim periods beginning after December 15, 2017. Early adoption of the standard is permitted. The standard will be applied in a retrospective approach for each period presented. The Company is currently evaluating the potential impact ASU 2016-15 will have on the Company's Consolidated Financial Statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) . ASU 2016-13 requires entities to establish an allowance for credit losses for most financial assets. Prior GAAP was based on an incurred loss methodology for recognizing credit losses on financial assets measured at amortized cost and available-for sale debt securities. The update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 31, 2018. The Company does not expect that adoption will have a significant impact on the Company's Consolidated Financial Statements or related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (ASU 2016-02). ASU 2016-02 establishes a comprehensive new lease accounting model. The new standard clarifies the definition of a lease and causes lessees to recognize leases on the balance sheet as a lease liability with a corresponding right-of-use asset for leases with a lease term of more than one year. ASU 2016-02 is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard requires a modified retrospective transition for capital or operating leases existing at or entered into after the beginning of the earliest comparative period presented in the financial statements, but it does not require transition accounting for leases that expire prior to the date of initial application. The Company is currently evaluating the impact that ASU 2016-02 will have on the Company's Consolidated Financial Statements and related disclosures. In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory (ASU 2015-11). The core principle of the guidance is that an entity should measure inventory at the "lower of cost and net realizable value" and options that currently exist for "market value" will be eliminated. The ASU defines net realizable value as the "estimated selling prices in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation." The standard is effective for the Company's financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of ASU 2015-11 to have a material impact on its Consolidated Financial Statements or related disclosures. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASU 2014-15), to provide guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. The amendments in this update are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The Company does not expect the adoption of ASU 2014-15 to have a significant impact on its Consolidated Financial Statements or related disclosures. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASU 2014-09), that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. ASU 2014-09 becomes effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606) — Deferral of the Effective Date (ASU 2015-14) , which defers the effective date of ASU 2014-09 for one year and permits early adoption as early as the original effective date of ASU 2014-09. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. In 2016, the FASB issued additional guidance to clarify the implementation guidance (ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ). The Company is in the process of evaluating the available transition methods and the impact the guidance will have on the Company's Consolidated Financial Statements and related disclosures. Other accounting standards and recent pronouncements that are not anticipated to have an impact on or are unrelated to the Company’s financial condition, results of operations, cash flows or disclosures are not discussed herein. Reclassifications Certain amounts in the Condensed Consolidated Statement of Operations for the three and six months ended September 30, 2015, have been reclassified to conform to the current period presentation. These reclassifications had no impact on previously reported amounts for total stockholders' equity or net income (loss).

Restructuring Charge (Notes)

Restructuring Charge (Notes)	6 Months Ended
	Sep. 30, 2016
Restructuring Charges [Abstract]
Restructuring Charge	Restructuring Charges In the fourth quarter of fiscal year 2015, the Company approved a plan to restructure its business, including reduction of headcount and consolidation of office space within the Aurora headquarters facility, with the intent to optimize operations. The restructuring was substantially completed during the fourth quarter of fiscal year 2015. The Company recognized a restructuring expense of $3.2 million in the three months ended March 31, 2015, inclusive of a non-cash charge of $2.7 million related to a loss on a lease, net of sublease income (the 2015 restructuring). The Company recognized a restructuring expense of $17,000 in the six months ended September 30, 2015 . In the fourth quarter of fiscal year 2016, the Company approved a plan to restructure its business, including reduction of headcount and lease termination costs related to closing the design center in Canada, to bring operating costs and expenses in-line with anticipated business volumes (the 2016 restructuring). The 2016 restructuring was completed during the fourth quarter of fiscal year 2016, during which the Company recognized a restructuring expense of $0.7 million . All of these costs have been paid as of September 30, 2016. In the first quarter of fiscal year 2017, the Company approved a restructuring plan (the 2017 restructuring) , i ncluding discontinuing development of the ClearLink Distributed Antenna System (DAS), a reduction of headcount, and consolidation of facilities in Manchester, NH and Aurora, IL. The Company recognized a restructuring expense of $2.6 million in the three and six months ended September 30, 2016 , inclusive of non-cash charges of approximately $1.0 million related to losses on leased facilities, $0.9 million of employee termination costs, and $0.7 million of other associated costs. In addition to the restructuring expense, a $1.2 million impairment charge of fixed assets and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory which was recorded in the six months ended September 30, 2016. The Company expects to incur further restructuring costs of approximately $0.4 million for the remainder of the 2017 restructuring plan. The planned restructuring is scheduled to be substantially completed by March 31, 2017. As of September 30, 2016 , $3.0 million and $0.2 million of the restructuring costs, primarily related to the office space from the 2015 restructuring and 2017 restructuring, are unpaid and accrued on the Condensed Consolidated Balance Sheets presented in accrued restructuring and accrued restructuring non-current, respectively. As of March 31, 2016, $1.5 million and $0.6 million of the restructuring costs, primarily related to the office space from the 2015 restructuring, are unpaid and accrued on the Condensed Consolidated Balance Sheets presented in accrued restructuring and accrued restructuring non-current, respectively. The restructuring costs are expected to be paid in full by the first quarter of fiscal year 2019 concurrent with the termination date of the contractual lease. Total liability for restructuring charges and their utilization for the six months ended September 30, 2016 , and 2015 , are summarized as follows: Six months ended September 30, 2016 Six months ended September 30, 2015 (in thousands) Employee-related Other costs Total Employee-related Other costs Total Liability at beginning of period $ 441 $ 1,646 $ 2,087 $ 15 $ 2,788 $ 2,803 Charged 869 1,696 2,565 17 — 17 Paid (891 ) (618 ) (1,509 ) (32 ) (597 ) (629 ) Liability at end of period $ 419 $ 2,724 $ 3,143 $ — $ 2,191 $ 2,191

Interim Segment Information (No

Interim Segment Information (Notes)	6 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Interim Segment Information	Interim Segment Information Segment information is presented in accordance with a “management approach", which designates the internal reporting used by the chief operating decision-maker (CODM) for making decisions and assessing performance as the source of the Company's reportable segments. Westell’s Chief Executive Officer is the CODM. In the first quarter of fiscal 2017, the Company re-aligned the business and revised its segments into three reportable operating segments . The CODM continues to define segment profit as gross profit less research and development expenses. In order to provide information that is comparable year to year, fiscal year 2016 segment information has been restated to reflect the new reporting structure. The accounting policies of the segments are the same as those for Westell Technologies, Inc. described in the summary of significant accounting policies included in the Company's Annual Report on Form 10-K for year ended March 31, 2016. The Company’s three reportable segments are as follows: In-Building Wireless (IBW) Segment The IBW segment solutions include distributed antenna systems (DAS) conditioners, high-performance digital repeaters and bi-directional amplifiers (BDAs), and system components and antennas, all used by wireless service providers and neutral-host operators to fine tune radio frequency (RF) signals that helps extend coverage to areas not served well or at all by traditional cell sites. Intelligent Site Management and Services (ISMS) Segment The ISMS segment solutions, which were formerly part of the Communications Solutions Group (CSG) segment, are as follows: • Intelligent Site Management (ISM) solutions include a suite of remote monitoring and control devices which, when combined with the Company's Optima management software system, provide comprehensive machine-to-machine (M2M) communications that enable operators to remotely monitor, manage, and control site infrastructure and support systems. • Service offerings include support agreements and deployment services. While the Company currently provides technical support and deployment services primarily for the ISM solution. Communications Network Solutions (CNS) Segment The CNS segment solutions, which were also formerly part of the Communications Solutions Group (CSG) segment, are as follows: • Outside Plant (OSP) solutions, which are sold to wireline and wireless service providers as well as industrial network operators, include a broad range of offerings, including integrated cabinets, power distribution products, copper and fiber network connectivity panels, and synchronous optical networks/time division multiplexing (SONET/TDM) network interface units. • Cell Site Optimization (CSO) solutions include tower mounted amplifiers (TMAs), small outdoor-hardened units mounted next to antennas on cell towers, enabling wireless service providers to improve the overall performance of a cell site, including increasing data throughput and reducing dropped connections. Segment information for the six months ended September 30, 2016 , and 2015 , is set forth below: Three months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 6,644 $ 5,109 $ 6,027 $ 17,780 Cost of revenue 4,411 (1) 2,702 4,300 11,413 Gross profit 2,233 2,407 1,727 6,367 Gross margin 33.6 % 47.1 % 28.7 % 35.8 % Research and development 1,594 1,237 496 3,327 Segment profit (loss) $ 639 $ 1,170 $ 1,231 3,040 Operating expenses: Sales and marketing 2,896 General and administrative 2,218 Intangible amortization 1,201 Restructuring 2,601 Operating profit (loss) (5,876 ) Other income (expense), net 74 Income tax benefit (expense) (8 ) Net income (loss) from continuing operations $ (5,810 ) Three months ended September 30, 2015 (in thousands) IBW ISMS CNS Total Revenue $ 10,819 $ 5,886 $ 8,809 $ 25,514 Cost of revenue 6,272 2,722 6,289 15,283 Gross profit 4,547 3,164 2,520 10,231 Gross margin 42.0 % 53.8 % 28.6 % 40.1 % Research and development 2,775 1,302 548 4,625 Segment profit (loss) $ 1,772 $ 1,862 $ 1,972 5,606 Operating expenses: Sales and marketing 4,113 General and administrative 2,493 Intangible amortization 1,432 Operating profit (loss) (2,432 ) Other income (expense), net (61 ) Income tax benefit (expense) 20 Net income (loss) from continuing operations $ (2,473 ) Six months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 12,765 $ 9,248 $ 10,583 $ 32,596 Cost of revenue 9,538 (1) 4,822 7,304 21,664 (1) Gross profit 3,227 4,426 3,279 10,932 Gross margin 25.3 % 47.9 % 31.0 % 33.5 % Research and development 3,958 2,531 1,115 7,604 Segment profit (loss) $ (731 ) $ 1,895 $ 2,164 3,328 Operating expenses: Sales and marketing 6,277 General and administrative 4,563 Intangible amortization 2,401 Restructuring 2,565 Long-lived assets impairment 1,181 Operating profit (loss) (13,659 ) Other income (expense), net 91 Income tax benefit (expense) (10 ) Net income (loss) from continuing operations $ (13,578 ) Six months ended September 30, 2015 (in thousands) IBW ISMS CNS Total Revenue $ 19,889 $ 10,391 $ 16,804 $ 47,084 Cost of revenue 11,341 5,016 12,067 28,424 Gross profit 8,548 5,375 4,737 18,660 Gross margin 43.0 % 51.7 % 28.2 % 39.6 % Research and development 5,937 2,583 1,191 9,711 Segment profit (loss) $ 2,611 $ 2,792 $ 3,546 8,949 Operating expenses: Sales and marketing 7,309 General and administrative 5,462 Intangible amortization 2,831 Restructuring 17 Operating profit (loss) (6,670 ) Other income (expense), net (23 ) Income tax benefit (expense) 82 Net income (loss) from continuing operations $ (6,611 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2 , Restructuring Charges . Segment asset information is not reported to or used by the CODM.

Inventories (Notes)

Inventories (Notes)	6 Months Ended
	Sep. 30, 2016
Inventory, Net [Abstract]
Inventories	Inventories Inventories are stated at the lower of first-in, first-out cost or market value. The components of inventories are as follows: (in thousands) September 30, 2016 March 31, 2016 Raw materials $ 3,659 $ 6,174 Work-in-process 210 237 Finished goods 8,809 7,087 Total inventories $ 12,678 $ 13,498

Stock-Based Compensation (Notes

Stock-Based Compensation (Notes)	6 Months Ended
	Sep. 30, 2016
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Westell Technologies, Inc. 2015 Omnibus Incentive Compensation Plan (the 2015 Plan) was approved at the annual meeting of stockholders on September 16, 2015. The 2015 Plan replaced the Westell Technologies, Inc. 2004 Stock Incentive Plan (the 2004 Plan). If any award granted under the 2015 Plan or the 2004 Plan is canceled, terminates, expires, or lapses for any reason, any Shares subject to such award shall again be available for the grant of an award under the 2015 Plan. Shares subject to an award shall not again be made available for issuance under the Plan if such Shares are: (a) shares delivered to or withheld by the Company to pay the grant or purchase price of an award, or (b) shares delivered to or withheld by the Company to pay the withholding taxes related to an award. Any awards or portions thereof that are settled in cash and not in Shares shall not be counted against the foregoing Share limit. The stock options, restricted stock awards, and restricted stock units (RSUs) awarded under the 2015 Plan vest in equal annual installments over 3 years for employees and 1 year for independent directors. The stock options, restricted stock awards, and RSUs awarded under the 2004 Plan vest in equal annual installments over 4 years . Performance stock units (PSUs) earned vest over the performance period, as described below. Certain awards provide for accelerated vesting if there is a change in control (as defined in the 2015 Plan), or when provided within individual employment contracts. The Company recorded incremental stock-based compensation expense of approximately $0.4 million during the three and six months ended September 30, 2016, as a result of accelerated vesting. The Company accounts for forfeitures as they occur. The Company issues new shares for stock awards under the 2015 Plan. The following table is a summary of total stock-based compensation expense resulting from stock options, restricted stock, RSUs and PSUs, during the six months ended September 30, 2016 , and 2015 : Three months ended September 30, Six months ended September 30, (in thousands) 2016 2015 2016 2015 Stock-based compensation expense $ 687 $ 253 $ 1,093 $ 710 Income tax benefit — — — — Total stock-based compensation expense, after taxes $ 687 $ 253 $ 1,093 $ 710 Stock Options Stock option activity for the six months ended September 30, 2016 , is as follows: Shares Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands) Outstanding on March 31, 2016 1,847,500 $ 1.42 5.6 $ 9 Granted 1,459,750 1.08 Exercised — — Forfeited (1,136,875 ) 1.19 Expired (80,667 ) 2.22 Outstanding on September 30, 2016 2,089,708 $ 1.27 4.8 $ 0 (1) The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date. The weighted-average grant date fair value of stock options granted during the six months ended September 30, 2016 , was $0.43 per share. Restricted Stock The following table sets forth restricted stock activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 217,500 $ 2.07 Granted 60,000 0.50 Vested (162,500 ) 1.71 Forfeited — — Non-vested as of September 30, 2016 115,000 $ 1.77 RSUs The following table sets forth the RSU activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 1,843,375 $ 1.59 Granted 1,737,250 1.02 Vested (633,956 ) 1.64 Forfeited (1,082,375 ) 1.29 Non-vested as of September 30, 2016 1,864,294 $ 1.21 PSUs The PSUs vest in annual increments based on the achievement of pre-established Company performance goals and continued employment. The number of PSUs earned, if any, can range from 0% to 200% of the target amount, depending on actual performance for four fiscal years following the grant date. Upon vesting, the PSUs convert into shares of Class A Common Stock on a one-for-one basis. The following table sets forth the PSU activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 (at target) 64,075 $ 3.29 Granted, at target — — Vested (11,713 ) 2.53 Forfeited (10,472 ) 3.43 Non-vested as of September 30, 2016 (at target) 41,890 $ 3.46

Product Warranties (Notes)

Product Warranties (Notes)	6 Months Ended
	Sep. 30, 2016
Product Warranties Disclosures [Abstract]
Product Warranties	Product Warranties The Company’s products carry a limited warranty ranging from one to five years for the products within the IBW segment, and typically one year for products within the ISMS segment, and one to seven years for products within the CNS segment. The specific terms and conditions of those warranties vary depending upon the customer and the products sold. Factors that affect the estimate of the Company’s warranty reserve include: the number of units shipped, anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the reserve as necessary. The current portions of the warranty reserve are $228,000 and $229,000 as of September 30, 2016 , and March 31, 2016 , respectively, and are presented on the Condensed Consolidated Balance Sheets in Accrued expenses. The non-current portions of the warranty reserves are $232,000 and $207,000 as of September 30, 2016 , and March 31, 2016 , respectively, and are presented on the Condensed Consolidated Balance Sheets in Other non-current liabilities. The following table presents the changes in the Company’s product warranty reserve: Three months ended September 30, Six months ended September 30, (in thousands) 2016 2015 2016 2015 Total product warranty reserve at the beginning of the period $ 439 $ 548 $ 436 $ 505 Warranty expense to cost of revenue 33 56 67 153 Utilization (12 ) (84 ) (43 ) (138 ) Total product warranty reserve at the end of the period $ 460 $ 520 $ 460 $ 520

Variable Interest Entity and Gu

Variable Interest Entity and Guarantee (Notes)	6 Months Ended
	Sep. 30, 2016
Guarantees [Abstract]
Equity Method Investment [Text Block]	Variable Interest Entity and Guarantee The Company has a 50% equity ownership in AccessTel Kentrox Australia PTY LTD (AKA). AKA distributes network management solutions provided by the Company and the other 50% owner to one customer. The Company holds equal voting control with the other owner. All actions of AKA are decided at the board level by majority vote. The Company evaluated ASC 810, Consolidations , and concluded that AKA is a variable interest entity (VIE). The Company has concluded that it is not the primary beneficiary of AKA and, therefore, consolidation is not required. As of September 30, 2016 , and March 31, 2016 , the carrying amount of the Company's investment in AKA was approximately $0.1 million , which is presented on the Condensed Consolidated Balance Sheets within Other non-current assets. The Company's revenue from sales to AKA for the three months ended September 30, 2016 , and 2015 , was $0.6 million and $0.9 million , respectively. The Company's revenue from sales to AKA for the six months ended September 30, 2016 , and 2015 , was $1.7 million and $1.4 million , respectively. Accounts receivable from AKA was $0.5 million and $0.6 million as of September 30, 2016 , and March 31, 2016 , respectively. Deferred revenue, which primarily relates to AKA maintenance contracts, was $2.0 million and $1.7 million as of September 30, 2016 , and March 31, 2016 , respectively. The Company also has provided an unlimited guarantee for the performance of the other 50% owner in AKA, which primarily provides support and engineering services to the customer. This guarantee was put in place at the request of the AKA customer. The guarantee, which is estimated to have a maximum potential future payment of $0.7 million , will stay in place as long as the contract between AKA and the customer is in place. The Company would have recourse against the other 50% owner in AKA in the event the guarantee is triggered. The Company determined that it could perform on the obligation it guaranteed at a positive rate of return and, therefore, did not assign value to the guarantee. The Company's exposure to loss as a result of its involvement with AKA, exclusive of lost profits, is limited to the items noted above.

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes At the end of each interim period, the Company makes its best estimate of the effective tax rate expected to be applicable for the full fiscal year and uses that rate to provide for income taxes on a current year-to-date basis before discrete items. If a reliable estimate cannot be made, the Company may make a reasonable estimate of the annual effective tax rate, including use of the actual effective rate for the year-to-date. The impact of discrete items is recorded in the quarter in which they occur. The Company utilizes the liability method of accounting for income taxes and deferred taxes, which are determined based on the differences between the financial statements and tax basis of assets and liabilities given the enacted tax laws. The Company evaluates the need for valuation allowances on the net deferred tax assets under the rules of ASC 740, Income Taxes. In assessing the realizability of the Company's deferred tax assets, the Company considered whether it is more likely than not that some or all of the deferred tax assets will be realized through the generation of future taxable income. In making this determination, the Company assessed all of the evidence available at the time, including recent earnings, forecasted income projections and historical performance. The Company determined that the negative evidence outweighed the objectively verifiable positive evidence and previously recorded a full valuation allowance against deferred tax assets. The Company will continue to reassess realizability going forward. The Company recorded $8,000 and $10,000 of income tax expense in the three and six months ended September 30, 2016 , using an effective income tax rate of (0.10)% plus discrete items. The Company recorded $20,000 and $82,000 of income tax benefit in the three and six months ended September 30, 2015 , using an effective rate of 1.20% plus discrete items. The effective rate is impacted by the intraperiod allocation as a result of loss from continuing operations and income from discontinued operations, loss in a foreign jurisdiction with no valuation allowance, and states which base tax on gross margin and not pretax income.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Obligations Future obligations and commitments, which are comprised of future minimum lease payments, inventory purchase obligations, and contingent consideration, were $9.9 million and $11.8 million at September 30, 2016 , and March 31, 2016 , respectively. Purchase obligations relate to inventory that arises in the normal course of business operations. Future obligations and commitments as of September 30, 2016 , consisted of the following: Payments due within (in thousands) Year 1 Year 2 Year 3 Year 4 Year 5 Thereafter Total Purchase obligations (1) $ 7,306 $ — $ — $ — $ — $ — $ 7,306 Future minimum operating lease payments 2,058 373 116 — — — 2,547 Future obligations and commitments $ 9,364 $ 373 $ 116 $ — $ — $ — $ 9,853 (1) A reserve for a net loss on firm purchase commitments of $452,000 and $388,000 is recorded on the balance sheet as of September 30, 2016 , and March 31, 2016 , respectively. Litigation and Contingency Reserves The Company and its subsidiaries are involved in various assertions, claims, proceedings and requests for indemnification concerning intellectual property, including patent infringement suits involving technologies that may be incorporated in the Company’s products, which are being handled and defended in the ordinary course of business. These matters are in various stages of investigation and litigation, and they are being vigorously defended. Although the Company does not expect that the outcome in any of these matters, individually or collectively, will have a material adverse effect on its financial condition or results of operations, litigation is inherently unpredictable. Therefore, judgments could be rendered, or settlements entered, that could adversely affect the Company’s operating results or cash flows in a particular period. The Company routinely assesses all of its litigation and threatened litigation as to the probability of ultimately incurring a liability, and it records its best estimate of the ultimate loss in situations where it assesses the likelihood of loss as probable. As of September 30, 2016 , and March 31, 2016 , the Company has not recorded any contingent liability attributable to existing litigation. As of March 31, 2015, the Company had total contingency reserves of $0.4 million related to the discontinued operations of ConferencePlus, which was sold in fiscal year 2012. In the six months ended September 30, 2015, a pre-tax gain of $0.4 million resulted from the expiration of an indemnity period and release of a contingency reserve related to the sale of ConferencePlus and was recorded in discontinued operations. Additionally, the Company had a contingent cash consideration payable related to an acquisition. As of March 31, 2016 , the fair value of the contingent consideration liability after offsetting a working capital adjustment and an indemnification claim for warranty obligations was $311,000 . As of September 30, 2016, the contingent liability was paid in full. The contingent consideration was based upon the profitability of the acquired products for post-closing periods through June 30, 2016, and was offset by working capital adjustments and other indemnification claims. The maximum earn-out that could have been paid before offsets was $3.5 million . The final calculation performed during the quarter ended June 30, 2016, determined the actual cash payment for the contingent consideration to be $2.1 million .

Short-term Investments (Notes)

Short-term Investments (Notes)	6 Months Ended
	Sep. 30, 2016
Short-term Investments [Abstract]
Short-term Investments	Short-term Investments As of March 31, 2016, the Company had short-term investments of $10.6 million . There were no short-term investments as of September 30, 2016, as they were all converted to cash equivalents. The Company did not sell any of the investments held as of March 31, 2016, prior to maturity. The fair value of short-term investments approximates their carrying amounts due to the short-term nature of these financial assets and, therefore, there are no unrecognized gains or losses.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	6 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined by ASC 820, Fair Value Measurements and Disclosures (ASC 820) , as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Quoted prices in active markets for identical assets and liabilities. • Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The Company’s money market funds are measured using Level 1 inputs. The contingent consideration described in Note 9 was measured using Level 3 inputs. The following table presents available-for sale securities and non-financial liabilities measured at fair value on a recurring basis as of September 30, 2016 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 17,129 $ 17,129 — — Cash and cash The following table presents available-for sale securities and non-financial liabilities measured at fair value on a recurring basis as of March 31, 2016 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 10,043 $ 10,043 — — Cash and cash Liabilities: Contingent consideration, current $ 311 — — $ 311 Contingent consideration payable The fair value of the money market funds approximates their carrying amounts due to the short-term nature of these financial assets. In connection with an acquisition in the quarter ended June 30, 2012, payment of a portion of the purchase price was contingent upon the profitability of the acquired products for post-closing periods through June 30, 2016, and was offset by working capital adjustments and other indemnification claims. The Company estimated the fair value of contingent consideration as the present value of the expected payments over the term of the arrangement based on financial forecasts of future profitability of the acquired products, and reaching the forecast. The final calculation performed during the quarter ended June 30, 2016, determined the actual cash payment for the contingent consideration to be $2.1 million , which was paid in full as of September 30, 2016 . The fair value measurement of contingent consideration as of March 31, 2016 , encompasses the following significant unobservable inputs: ($ in thousands) Unobservable Inputs March 31, 2016 Estimated earn-out contingent consideration $ 2,968 Working capital and other adjustment $ (444 ) Indemnification related to warranty claims $ (303 ) Discount rate — % Approximate timing of cash flows 0.4 years The following table summarizes contingent consideration activity: (in thousands) Balance as of March 31, 2016 $ 311 Contingent consideration – payments (175 ) Contingent consideration – change in fair value in General and Administrative expense (136 ) Balance as of September 30, 2016 $ —

Share Repurchases (Notes)

Share Repurchases (Notes)	6 Months Ended
	Sep. 30, 2016
Payments for Repurchase of Equity [Abstract]
Share Repurchases	Share Repurchases In August 2011, the Board of Directors authorized a share repurchase program whereby the Company may repurchase up to an aggregate of $20.0 million of its outstanding Class A Common Stock (the authorization). There were no shares repurchased under this authorization during the six months ended September 30, 2016 , or September 30, 2015. There was approximately $0.1 million remaining for additional share repurchases under this program as of September 30, 2016 . Additionally, in the six months ended September 30, 2016, and September 30, 2015, the Company repurchased 166,176 and 73,765 shares of Class A Common Stock, respectively, from certain employees that were surrendered to satisfy the minimum statutory tax withholding obligations on the vesting of restricted stock, RSUs and PSUs. These repurchases are not included in the authorized share repurchase program and had a weighted-average purchase price of $0.85 and $1.15 per share, respectively.

Intangibles and other Long-Live

Intangibles and other Long-Lived Assets (Notes)	6 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Disclosure [Text Block]	Intangible and Long-Lived Assets Intangible Assets Intangible assets include customer relationships, trade names, developed technology and other intangibles. Intangible assets with determinable lives are amortized over their estimated useful lives. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. If the carrying amount of an asset exceeds its estimated future undiscounted cash flows, an impairment loss is recorded for the excess of the asset’s carrying amount over its fair value. During fiscal year 2017, the Company experienced triggering events in the first and second quarters that resulted in the Company testing its intangible assets for impairment. As a result of the Company reorganizing its reporting structure in the first quarter of fiscal year 2017, the Company reassigned assets and liabilities to reporting units. In evaluating whether it is more likely than not that the fair value of the Company's reporting units were less than their carrying value, the Company assessed all relevant events and circumstances and determined that, due to the overall financial performance of the Company and recent change in reporting structure, indicators of impairment were present. The Company performed an evaluation to test IBW, ISMS and CNS intangible assets for recoverability and concluded there was no impairment during the six months ended September 30, 2016, in any of the reporting units. Long-lived Assets Long-lived assets consist of property and equipment. Long-lived assets that are held and used should be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the long-lived assets might not be recoverable. Due to a significant adverse change in the business climate connected to the ClearLink DAS development project, the Company determined indicators of impairment were present as of June 30, 2016. The Company determined that equipment related to development and manufacturing of this product were fully impaired and recorded an impairment charge of $1.2 million . Long-lived asset impairment charges are presented in long-lived asset impairment on the Condensed Consolidated Statements of Operations. See Note 2 Restructuring Charges .

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed consolidated financial statements	The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X and, accordingly, they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2016 . All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates.
New Accounting Pronouncements	Recently Issued Accounting Pronouncements Not Yet Adopted In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230) (ASU 2016-15). This update is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The update provides new guidance regarding the classification of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investments, beneficial interests in securitized transactions, and separately identifiable cash flows and application of the predominance principle. This standard will be effective for financial statements issued by public companies for the annual and interim periods beginning after December 15, 2017. Early adoption of the standard is permitted. The standard will be applied in a retrospective approach for each period presented. The Company is currently evaluating the potential impact ASU 2016-15 will have on the Company's Consolidated Financial Statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) . ASU 2016-13 requires entities to establish an allowance for credit losses for most financial assets. Prior GAAP was based on an incurred loss methodology for recognizing credit losses on financial assets measured at amortized cost and available-for sale debt securities. The update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 31, 2018. The Company does not expect that adoption will have a significant impact on the Company's Consolidated Financial Statements or related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (ASU 2016-02). ASU 2016-02 establishes a comprehensive new lease accounting model. The new standard clarifies the definition of a lease and causes lessees to recognize leases on the balance sheet as a lease liability with a corresponding right-of-use asset for leases with a lease term of more than one year. ASU 2016-02 is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard requires a modified retrospective transition for capital or operating leases existing at or entered into after the beginning of the earliest comparative period presented in the financial statements, but it does not require transition accounting for leases that expire prior to the date of initial application. The Company is currently evaluating the impact that ASU 2016-02 will have on the Company's Consolidated Financial Statements and related disclosures. In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory (ASU 2015-11). The core principle of the guidance is that an entity should measure inventory at the "lower of cost and net realizable value" and options that currently exist for "market value" will be eliminated. The ASU defines net realizable value as the "estimated selling prices in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation." The standard is effective for the Company's financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of ASU 2015-11 to have a material impact on its Consolidated Financial Statements or related disclosures. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASU 2014-15), to provide guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. The amendments in this update are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The Company does not expect the adoption of ASU 2014-15 to have a significant impact on its Consolidated Financial Statements or related disclosures. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASU 2014-09), that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. ASU 2014-09 becomes effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606) — Deferral of the Effective Date (ASU 2015-14) , which defers the effective date of ASU 2014-09 for one year and permits early adoption as early as the original effective date of ASU 2014-09. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. In 2016, the FASB issued additional guidance to clarify the implementation guidance (ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ). The Company is in the process of evaluating the available transition methods and the impact the guidance will have on the Company's Consolidated Financial Statements and related disclosures. Other accounting standards and recent pronouncements that are not anticipated to have an impact on or are unrelated to the Company’s financial condition, results of operations, cash flows or disclosures are not discussed herein.
Inventory	Inventories are stated at the lower of first-in, first-out cost or market value.
Fair Value Measurement	Fair value is defined by ASC 820, Fair Value Measurements and Disclosures (ASC 820) , as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Quoted prices in active markets for identical assets and liabilities. • Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

Restructuring Charge (Tables)

Restructuring Charge (Tables)	6 Months Ended
	Sep. 30, 2016
Restructuring Charges [Abstract]
Restructuring charges	Total liability for restructuring charges and their utilization for the six months ended September 30, 2016 , and 2015 , are summarized as follows: Six months ended September 30, 2016 Six months ended September 30, 2015 (in thousands) Employee-related Other costs Total Employee-related Other costs Total Liability at beginning of period $ 441 $ 1,646 $ 2,087 $ 15 $ 2,788 $ 2,803 Charged 869 1,696 2,565 17 — 17 Paid (891 ) (618 ) (1,509 ) (32 ) (597 ) (629 ) Liability at end of period $ 419 $ 2,724 $ 3,143 $ — $ 2,191 $ 2,191

Interim Segment Information (Ta

Interim Segment Information (Tables)	6 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment information	Segment information for the six months ended September 30, 2016 , and 2015 , is set forth below: Three months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 6,644 $ 5,109 $ 6,027 $ 17,780 Cost of revenue 4,411 (1) 2,702 4,300 11,413 Gross profit 2,233 2,407 1,727 6,367 Gross margin 33.6 % 47.1 % 28.7 % 35.8 % Research and development 1,594 1,237 496 3,327 Segment profit (loss) $ 639 $ 1,170 $ 1,231 3,040 Operating expenses: Sales and marketing 2,896 General and administrative 2,218 Intangible amortization 1,201 Restructuring 2,601 Operating profit (loss) (5,876 ) Other income (expense), net 74 Income tax benefit (expense) (8 ) Net income (loss) from continuing operations $ (5,810 ) Three months ended September 30, 2015 (in thousands) IBW ISMS CNS Total Revenue $ 10,819 $ 5,886 $ 8,809 $ 25,514 Cost of revenue 6,272 2,722 6,289 15,283 Gross profit 4,547 3,164 2,520 10,231 Gross margin 42.0 % 53.8 % 28.6 % 40.1 % Research and development 2,775 1,302 548 4,625 Segment profit (loss) $ 1,772 $ 1,862 $ 1,972 5,606 Operating expenses: Sales and marketing 4,113 General and administrative 2,493 Intangible amortization 1,432 Operating profit (loss) (2,432 ) Other income (expense), net (61 ) Income tax benefit (expense) 20 Net income (loss) from continuing operations $ (2,473 ) Six months ended September 30, 2016 (in thousands) IBW ISMS CNS Total Revenue $ 12,765 $ 9,248 $ 10,583 $ 32,596 Cost of revenue 9,538 (1) 4,822 7,304 21,664 (1) Gross profit 3,227 4,426 3,279 10,932 Gross margin 25.3 % 47.9 % 31.0 % 33.5 % Research and development 3,958 2,531 1,115 7,604 Segment profit (loss) $ (731 ) $ 1,895 $ 2,164 3,328 Operating expenses: Sales and marketing 6,277 General and administrative 4,563 Intangible amortization 2,401 Restructuring 2,565 Long-lived assets impairment 1,181 Operating profit (loss) (13,659 ) Other income (expense), net 91 Income tax benefit (expense) (10 ) Net income (loss) from continuing operations $ (13,578 ) Six months ended September 30, 2015 (in thousands) IBW ISMS CNS Total Revenue $ 19,889 $ 10,391 $ 16,804 $ 47,084 Cost of revenue 11,341 5,016 12,067 28,424 Gross profit 8,548 5,375 4,737 18,660 Gross margin 43.0 % 51.7 % 28.2 % 39.6 % Research and development 5,937 2,583 1,191 9,711 Segment profit (loss) $ 2,611 $ 2,792 $ 3,546 8,949 Operating expenses: Sales and marketing 7,309 General and administrative 5,462 Intangible amortization 2,831 Restructuring 17 Operating profit (loss) (6,670 ) Other income (expense), net (23 ) Income tax benefit (expense) 82 Net income (loss) from continuing operations $ (6,611 ) (1) The three and six months ended September 30, 2016, includes E&O expense for ClearLink DAS inventory and pipeline inventory. See Note 2 , Restructuring Charges .

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Sep. 30, 2016
Inventory, Net [Abstract]
Components of inventories	The components of inventories are as follows: (in thousands) September 30, 2016 March 31, 2016 Raw materials $ 3,659 $ 6,174 Work-in-process 210 237 Finished goods 8,809 7,087 Total inventories $ 12,678 $ 13,498

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Sep. 30, 2016
Share-based Compensation [Abstract]
Stock-based compensation expense	The following table is a summary of total stock-based compensation expense resulting from stock options, restricted stock, RSUs and PSUs, during the six months ended September 30, 2016 , and 2015 : Three months ended September 30, Six months ended September 30, (in thousands) 2016 2015 2016 2015 Stock-based compensation expense $ 687 $ 253 $ 1,093 $ 710 Income tax benefit — — — — Total stock-based compensation expense, after taxes $ 687 $ 253 $ 1,093 $ 710
Stock option activity	Stock option activity for the six months ended September 30, 2016 , is as follows: Shares Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands) Outstanding on March 31, 2016 1,847,500 $ 1.42 5.6 $ 9 Granted 1,459,750 1.08 Exercised — — Forfeited (1,136,875 ) 1.19 Expired (80,667 ) 2.22 Outstanding on September 30, 2016 2,089,708 $ 1.27 4.8 $ 0 (1) The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date
Restricted stock activity	Restricted Stock The following table sets forth restricted stock activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 217,500 $ 2.07 Granted 60,000 0.50 Vested (162,500 ) 1.71 Forfeited — — Non-vested as of September 30, 2016 115,000 $ 1.77 RSUs The following table sets forth the RSU activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 1,843,375 $ 1.59 Granted 1,737,250 1.02 Vested (633,956 ) 1.64 Forfeited (1,082,375 ) 1.29 Non-vested as of September 30, 2016 1,864,294 $ 1.21 PSUs The PSUs vest in annual increments based on the achievement of pre-established Company performance goals and continued employment. The number of PSUs earned, if any, can range from 0% to 200% of the target amount, depending on actual performance for four fiscal years following the grant date. Upon vesting, the PSUs convert into shares of Class A Common Stock on a one-for-one basis. The following table sets forth the PSU activity for the six months ended September 30, 2016 : Shares Weighted-Average Grant Date Fair Value Non-vested as of March 31, 2016 (at target) 64,075 $ 3.29 Granted, at target — — Vested (11,713 ) 2.53 Forfeited (10,472 ) 3.43 Non-vested as of September 30, 2016 (at target) 41,890 $ 3.46

Product Warranties (Tables)

Product Warranties (Tables)	6 Months Ended
	Sep. 30, 2016
Product Warranties Disclosures [Abstract]
Changes in Company's product warranty reserve	The following table presents the changes in the Company’s product warranty reserve: Three months ended September 30, Six months ended September 30, (in thousands) 2016 2015 2016 2015 Total product warranty reserve at the beginning of the period $ 439 $ 548 $ 436 $ 505 Warranty expense to cost of revenue 33 56 67 153 Utilization (12 ) (84 ) (43 ) (138 ) Total product warranty reserve at the end of the period $ 460 $ 520 $ 460 $ 520

Commitments and Contingencies26

Commitments and Contingencies (Tables)	6 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	Future obligations and commitments as of September 30, 2016 , consisted of the following: Payments due within (in thousands) Year 1 Year 2 Year 3 Year 4 Year 5 Thereafter Total Purchase obligations (1) $ 7,306 $ — $ — $ — $ — $ — $ 7,306 Future minimum operating lease payments 2,058 373 116 — — — 2,547 Future obligations and commitments $ 9,364 $ 373 $ 116 $ — $ — $ — $ 9,853 (1) A reserve for a net loss on firm purchase commitments of $452,000 and $388,000 is recorded on the balance sheet as of September 30, 2016 , and March 31, 2016 , respectively.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	The following table presents available-for sale securities and non-financial liabilities measured at fair value on a recurring basis as of September 30, 2016 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 17,129 $ 17,129 — — Cash and cash The following table presents available-for sale securities and non-financial liabilities measured at fair value on a recurring basis as of March 31, 2016 : (in thousands) Total Fair Value Quoted Prices in Significant Other Significant Balance Sheet Assets: Money market funds $ 10,043 $ 10,043 — — Cash and cash Liabilities: Contingent consideration, current $ 311 — — $ 311 Contingent consideration payable
Fair value measurement of contingent consideration	The fair value measurement of contingent consideration as of March 31, 2016 , encompasses the following significant unobservable inputs: ($ in thousands) Unobservable Inputs March 31, 2016 Estimated earn-out contingent consideration $ 2,968 Working capital and other adjustment $ (444 ) Indemnification related to warranty claims $ (303 ) Discount rate — % Approximate timing of cash flows 0.4 years
Summarizes contingent consideration activity	The following table summarizes contingent consideration activity: (in thousands) Balance as of March 31, 2016 $ 311 Contingent consideration – payments (175 ) Contingent consideration – change in fair value in General and Administrative expense (136 ) Balance as of September 30, 2016 $ —

Restructuring Charge (Details)

Restructuring Charge (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Restructuring charges
Liability at beginning of period			$ 2,087	$ 2,803	$ 2,803
Restructuring Charges	$ 2,601	$ 3,200	2,565	17	700
Paid			(1,509)	(629)
Liability at end of period	3,143	2,803	3,143	2,191	2,087
Employee Severance [Member]
Restructuring charges
Liability at beginning of period			441	15	15
Restructuring Charges			869	17
Paid			(891)	(32)
Liability at end of period	419	15	419	0	441
Other Restructuring [Member]
Restructuring charges
Liability at beginning of period			1,646	2,788	2,788
Restructuring Charges			1,696	0
Paid			(618)	(597)
Liability at end of period	$ 2,724	$ 2,788	$ 2,724	$ 2,191	$ 1,646

Restructuring Charge (Details T

Restructuring Charge (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 0		$ 1,181	$ 0
Production Related Impairments or Charges	200			1,600
estimatefuturerestructuringcharge	400			400
Restructuring Charge (Textual) [Abstract]
Restructuring	2,601		$ 3,200	2,565	17	$ 700
Impairment of Leasehold			2,700	1,000
Unpaid balance of restructuring charges	3,143	2,191	2,803	3,143	2,191	2,087
restructuringexpenseconsultants				700
Restructuring Reserve, Current	2,951			2,951		1,537
Restructuring Reserve, Noncurrent	192			192		550
Employee Severance [Member]
Restructuring Charge (Textual) [Abstract]
Restructuring				869	17
Unpaid balance of restructuring charges	419	0	15	419	0	441
Other Restructuring [Member]
Restructuring Charge (Textual) [Abstract]
Restructuring				1,696	0
Unpaid balance of restructuring charges	$ 2,724	$ 2,191	$ 2,788	$ 2,724	$ 2,191	$ 1,646

Interim Segment Information (De

Interim Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended			12 Months Ended
	Sep. 30, 2016		Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016		Sep. 30, 2015	Mar. 31, 2016
Segment information
Revenue	$ 17,780		$ 25,514		$ 32,596		$ 47,084
Cost of revenue (1)	11,413	[1]	15,283		21,664	[1]	28,424
Gross profit	$ 6,367		$ 10,231		$ 10,932		$ 18,660
Gross margin	35.80%		40.10%		33.50%		39.60%
Research and development	$ 3,327		$ 4,625		$ 7,604		$ 9,711
Segment Profit Loss	3,040		5,606		3,328		8,949
Operating expenses:
Sales and marketing	2,896		4,113		6,277		7,309
General and administrative	2,218		2,493		4,563		5,462
Intangible amortization	1,201		1,432		2,401		2,831
Restructuring	2,601			$ 3,200	2,565		17	$ 700
Impairment of Long-Lived Assets to be Disposed of	0		0		1,181		0
Operating profit (loss)	(5,876)		(2,432)		(13,659)		(6,670)
Other Nonoperating Income (Expense)	74		(61)		91		(23)
Income Tax Expense (Benefit)	8		(20)		10		(82)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(5,810)		(2,473)		(13,578)		(6,611)
IBW [Member]
Segment information
Revenue	6,644		10,819		12,765		19,889
Cost of revenue (1)	4,411	[1]	6,272		9,538	[1]	11,341
Gross profit	$ 2,233		$ 4,547		$ 3,227		$ 8,548
Gross margin	33.60%		42.00%		25.30%		43.00%
Research and development	$ 1,594		$ 2,775		$ 3,958		$ 5,937
Segment Profit Loss	639		1,772		(731)		2,611
ISMS [Member]
Segment information
Revenue	5,109		5,886		9,248		10,391
Cost of revenue (1)	2,702		2,722		4,822		5,016
Gross profit	$ 2,407		$ 3,164		$ 4,426		$ 5,375
Gross margin	47.10%		53.80%		47.90%		51.70%
Research and development	$ 1,237		$ 1,302		$ 2,531		$ 2,583
Segment Profit Loss	1,170		1,862		1,895		2,792
CNS [Member]
Segment information
Revenue	6,027		8,809		10,583		16,804
Cost of revenue (1)	4,300		6,289		7,304		12,067
Gross profit	$ 1,727		$ 2,520		$ 3,279		$ 4,737
Gross margin	28.70%		28.60%		31.00%		28.20%
Research and development	$ 496		$ 548		$ 1,115		$ 1,191
Segment Profit Loss	$ 1,231		$ 1,972		$ 2,164		$ 3,546
[1]	The three and six months ended September 30, 2016, includes $0.2 million and $1.6 million of E&O expense for ClearLink DAS inventory and pipeline inventory.

Interim Segment Information (31

Interim Segment Information (Details Textual)	6 Months Ended
	Sep. 30, 2016segments
Segment Reporting [Abstract]
Number of Reportable Segments	3

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Components of inventories
Raw materials	$ 3,659	$ 6,174
Work-in-process	210	237
Finished goods	8,809	7,087
Total inventories	$ 12,678	$ 13,498

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stock-based compensation expense
Stock-based compensation expense	$ 687	$ 253	$ 1,093	$ 710
Income tax benefit	0	0	0	0
Total stock-based compensation expense, after taxes	$ 687	$ 253	$ 1,093	$ 710

Stock-Based Compensation (Det34

Stock-Based Compensation (Details 1) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
		Sep. 30, 2016	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding on March 31, 2016		1,847,500
Granted		1,459,750
Exercised		0
Forfeited		(1,136,875)
Expired		(80,667)
Outstanding on September 30, 2016		2,089,708	1,847,500
Weighted-Average Exercise Price Per Share, Outstanding on March 31, 2016		$ 1.42
Weighted-Average Exercise Price Per Share, Granted		1.08
Weighted-Average Exercise Price Per Share, Exercised		0
Weighted-Average Exercise Price Per Share, Forfeited		1.19
Weighted-Average Exercise Price Per Share, Expired		2.22
Weighted-Average Exercise Price Per Share, Outstanding on September 30, 2016		$ 1.27	$ 1.42
Weighted-Average Remaining Contractual Term (in years), Outstanding on March 31, 2016		4 years 9 months 11 days	5 years 6 months 26 days
Weighted-Average Remaining Contractual Term (in years), Outstanding on September 30, 2016		4 years 9 months 11 days	5 years 6 months 26 days
Aggregate Intrinsic Value, Outstanding on March 31, 2016	[1]	$ 9
Aggregate Intrinsic Value, Outstanding on September 30, 2016	[1]	$ 0	$ 9
[1]	The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the Westell Technologies’ closing stock price as of the respective reporting date

Stock-Based Compensation (Det35

Stock-Based Compensation (Details 2)	6 Months Ended
	Sep. 30, 2016$ / sharesshares
Restricted Stock [Member]
Restricted stock activity
Non-vested as of March 31, 2016 | shares	217,500
Granted | shares	60,000
Vested | shares	(162,500)
Forfeited | shares	0
Non-vested as of September 30, 2016 | shares	115,000
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2016 | $ / shares	$ 2.07
Weighted-Average Grant Date Fair Value, Granted | $ / shares	0.50
Weighted-Average Grant Date Fair Value, Vested | $ / shares	1.71
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	0
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2016 | $ / shares	$ 1.77
Restricted Stock Units (RSUs) [Member]
Restricted stock activity
Non-vested as of March 31, 2016 | shares	1,843,375
Granted | shares	1,737,250
Vested | shares	(633,956)
Forfeited | shares	(1,082,375)
Non-vested as of September 30, 2016 | shares	1,864,294
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2016 | $ / shares	$ 1.59
Weighted-Average Grant Date Fair Value, Granted | $ / shares	1.02
Weighted-Average Grant Date Fair Value, Vested | $ / shares	1.64
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	1.29
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2016 | $ / shares	$ 1.21
Performance Shares [Member]
Restricted stock activity
Non-vested as of March 31, 2016 | shares	64,075
Granted | shares	0
Vested | shares	(11,713)
Forfeited | shares	(10,472)
Non-vested as of September 30, 2016 | shares	41,890
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2016 | $ / shares	$ 3.29
Weighted-Average Grant Date Fair Value, Granted | $ / shares	0
Weighted-Average Grant Date Fair Value, Vested | $ / shares	2.53
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	3.43
Weighted-Average Grant Date Fair Value, Non-vested as of September 30, 2016 | $ / shares	$ 3.46

Stock-Based Compensation (Det36

Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 0.43
IncrementalStockbasedCompensationExpenseDuetoAcceleration	$ 0.4	$ 0.4
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential PSU attainment range		0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential PSU attainment range		200.00%
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments		4 years
Restricted Stock Units (RSUs) [Member] | 2015 Omnibus Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments		3 years
Restricted Stock [Member] | 2015 Omnibus Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule of equal annual installments		1 year

Product Warranties (Details)

Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in Company's standard product warranty reserve [Roll Forward]
Total product warranty reserve at the beginning of the period	$ 439	$ 548	$ 436	$ 505
Warranty expense to cost of revenue	33	56	67	153
Utilization	(12)	(84)	(43)	(138)
Total product warranty reserve at the end of the period	$ 460	$ 520	$ 460	$ 520

Product Warranties (Details Tex

Product Warranties (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Mar. 31, 2016
Product Warranties (Textual) [Abstract]
Current portions of warranty reserve	$ 228	$ 229
Non-current portions of the warranty reserve	$ 232	$ 207
IBW [Member] | Minimum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P1Y
IBW [Member] | Maximum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P5Y
ISMS [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	one
CNS [Member] | Minimum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P1Y
CNS [Member] | Maximum [Member]
Product Warranties (Textual) [Abstract]
Standard Product Warranty Description	P7Y

Variable Interest Entity and 39

Variable Interest Entity and Guarantee (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	Apr. 02, 2013
Concentration Risk [Line Items]
Revenue	$ 17,780	$ 25,514	$ 32,596	$ 47,084
AKA [Member]
Concentration Risk [Line Items]
Equity Method Investments	100		100		$ 100
Revenue	600	$ 900	1,700	$ 1,400
Accounts Receivable, Net, Current	500		500		600
Deferred Revenue	2,000		2,000		$ 1,700
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 700		$ 700
AKA [Member]
Concentration Risk [Line Items]
Equity Method Investment, Ownership Percentage						50.00%

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes (Textual) [Abstract]
Income tax benefit (expense)	$ (8)	$ 20	$ (10)	$ 82
Effective tax rate			(0.10%)	1.20%

Commitments and Contingencies41

Commitments and Contingencies (Details) - USD ($)		Sep. 30, 2016	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Purchase Obligation, Due in Next Twelve Months	[1]	$ 7,306,000
Purchase Obligation	[1]	7,306,000
Future minimum operating lease payments Due, Next Twelve Months		2,058,000
Future minimum operating lease payments, Due in Two Years		373,000
Future minimum operating lease payments, Due in Three Years		116,000
Future minimum operating lease payments, Due in Four Years		0
Future minimum operating lease payments Due		2,547,000
Future obligations and commitments, Due in Next Twelve Months		9,364,000
Future obligations and commitments, Due in Second Year		373,000
Future obligations and commitments, Due in Third Year		116,000
Future obligations and commitments, Due in Fourth Year		0
Future obligations and commitments		9,853,000	$ 11,800,000
Reserve on Firm Purchase Commitments		$ 452,000	$ 388,000
[1]	A reserve for a net loss on firm purchase commitments of $452,000 and $388,000 is recorded on the balance sheet as of September 30, 2016, and March 31, 2016, respectively.

Commitments and Contingencies42

Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015
Loss Contingencies [Line Items]
Future obligations and commitments		$ 9,853		$ 11,800
Total contingent reserves related to intellectual property and indemnification claims					$ 400
gain (loss) on contingency settlement disco	$ 400
Fair value of contingent consideration liability after offset of working capital adjustment and indemnification claim		$ 0		$ 311
Maximum ANTONE earn-out that could be paid before offsets			$ 3,500
BusinessCombinationContingentConsiderationArrangementsRangeNetOfOutcomesValueLow			$ 2,100

Short-term Investments (Details

Short-term Investments (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Short-term Investments [Abstract]
Short-term investments	$ 0	$ 10,555

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Contingent consideration payable	$ 0	$ 311
Recurring [Member] | Cash and cash equivalents [Member]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Money market funds	17,129	10,043
Recurring [Member] | Accrued Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Contingent consideration payable		311
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and cash equivalents [Member]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Money market funds	$ 17,129	10,043
Recurring [Member] | Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs
Contingent consideration payable		$ 311

Fair Value Measurements (Deta45

Fair Value Measurements (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Jun. 30, 2016
Fair value measurement of contingent consideration
Maximum ANTONE earn-out that could be paid before offsets		$ 3,500
Unobservable Inputs (Level 3) [Member]
Fair value measurement of contingent consideration
Maximum ANTONE earn-out that could be paid before offsets	$ 2,968
Working capital and other adjustment	(444)
Indemnification related to warranty claims	$ (303)
Discount rate	0.00%
Approximate timing of cash flows	4 months 10 days

Fair Value Measurements (Deta46

Fair Value Measurements (Details 2) $ in Thousands	6 Months Ended
	Sep. 30, 2016USD ($)
Summarizes contingent consideration activity
Balance as of March 31, 2016	$ 311
Contingent consideration – payments	(175)
Contingent consideration – change in fair value in General and Administrative expense	(136)
Balance as of September 30, 2016	$ 0

Fair Value Measurements (Deta47

Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Fair Value Disclosures [Abstract]
BusinessCombinationContingentConsiderationArrangementsRangeNetOfOutcomesValueLow		$ 2,100
Contingent consideration payable	$ 0		$ 311

Share Repurchases (Details Text

Share Repurchases (Details Textual) - Class A Common Stock - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Aug. 31, 2011
August 2011 authorization [Member]
Share Repurchases (Textual) [Abstract]
Stock Repurchase Program			$ 20
Treasury Stock, Shares, Acquired	0	0
Stock Repurchase Program Remaining Authorized Repurchases Amount	$ 0.1
Outside of Publically Announced Repurchase Program [Member]
Share Repurchases (Textual) [Abstract]
Treasury Stock, Shares, Acquired	166,176	73,765
Treasury stock acquired volume weighted-average price	$ 0.85	$ 1.15

Intangibles and other Long-Li49

Intangibles and other Long-Lived Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of Intangible Assets, Finite-lived			$ 0
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 0	$ 1,181,000	$ 0